I do think it's important to have an idea of how much the faculty are publishing, but the rankings don't indicate how much of that publishing is what student co-authors, which I think is even more important for prospective students. I'm also concerned about advisor experience/tenure because I've heard both positive and negative things about older professors: some say that are great because they have a larger network and are more well-known in the field, whereas others say that because they have tenure they are less motivated to publish and care less about student success. Of course, during the interview/visitation weekends, it's hard to judge this because obviously students and faculty are going to be raving about their own programs. Is it possible to get an objective perspective on this?